The first thing you will need is a square of paper, because origami model are usually folded
from a square. You can buy paper square-sized, but you can also easily create your square from a rectangle.
Fold along the crease in blue, thus bringing the edge at the top along the one at the left. | |
And the top part is now a square ! |
To learn crease patterns, I recommend Eilen's origami page and Ben Ball's site, and a lot of practice.